Question 1113518
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The expression |a-b| means the difference between a and b, regardless of which is larger.<bR>
The given statement says that the difference between P and 500 is always less than or equal to 20.  So<br>
{{{abs(p-500)<=20}}}<br>
To solve the inequality algebraically, note that the inequality says that the value of (p-500) is between -20 and +20.  So<br>
{{{-20 <= P-500 <= 20}}}
{{{-20+500 <= P <= 20+500}}}
{{{480 <= P <= 520}}}